CODEWITHSUNDEEP
springspring-integration
Ashok.N
Ashok.N

Reputation: 1391

int:transformer expression error- The value of attribute "expression" associated with an element type "null" must not contain the '<' character

I am using spring integration in my project. I want to append <response> and </response> as strings to my payload before and after respectively. I am using int:transformer to do this. The following is the piece of code:

<int:transformer    expression="'<response>' + payload + '</response>'"/>

But when I use the above expression, I am getting the following exception:

Caused by: org.xml.sax.SAXParseException: The value of attribute "expression" associated with an element type "null" must not contain the '<' character.
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanAttributeValue(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanAttribute(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source)
    at org.springframework.beans.factory.xml.DefaultDocumentLoader.loadDocument(DefaultDocumentLoader.java:75)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:388)
    ... 58 more

Can anybody tell me how my expression should be to accomplish my task?

Upvotes: 1

Views: 306

Answers (1)

Artem Bilan
Artem Bilan

Reputation: 121337

Like this:

<int:transformer expression="'&lt;response>' + payload + '&lt;/response>'"/>

Since you define string literal with XML in the XML you should escape those symbols which represent XML language per se.

Upvotes: 4

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